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| 1 // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are |
| 4 // met: |
| 5 // |
| 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided |
| 11 // with the distribution. |
| 12 // * Neither the name of Google Inc. nor the names of its |
| 13 // contributors may be used to endorse or promote products derived |
| 14 // from this software without specific prior written permission. |
| 15 // |
| 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 |
| 28 // Flags: --expose-externalize-string |
| 29 |
| 30 var size = 1024; |
| 31 |
| 32 function test() { |
| 33 var str = ""; |
| 34 |
| 35 // Build an ascii cons string. |
| 36 for (var i = 0; i < size; i++) { |
| 37 str += String.fromCharCode(i & 0x7f); |
| 38 } |
| 39 assertTrue(isAsciiString(str)); |
| 40 |
| 41 var twoByteExternalWithAsciiData = |
| 42 "AA" + (function() { return "A"; })(); |
| 43 externalizeString(twoByteExternalWithAsciiData, true /* force two-byte */); |
| 44 assertFalse(isAsciiString(twoByteExternalWithAsciiData)); |
| 45 |
| 46 var realTwoByteExternalString = |
| 47 "\u1234\u1234" + (function() { return "\u1234"; })(); |
| 48 externalizeString(realTwoByteExternalString); |
| 49 assertFalse(isAsciiString(realTwoByteExternalString)); |
| 50 |
| 51 assertTrue(isAsciiString(["a", twoByteExternalWithAsciiData].join(""))); |
| 52 |
| 53 // Appending a two-byte string that contains only ascii chars should |
| 54 // still produce an ascii cons. |
| 55 var str1 = str + twoByteExternalWithAsciiData; |
| 56 assertTrue(isAsciiString(str1)); |
| 57 |
| 58 // Force flattening of the string. |
| 59 var old_length = str1.length - twoByteExternalWithAsciiData.length; |
| 60 for (var i = 0; i < old_length; i++) { |
| 61 assertEquals(String.fromCharCode(i & 0x7f), str1[i]); |
| 62 } |
| 63 for (var i = old_length; i < str1.length; i++) { |
| 64 assertEquals("A", str1[i]); |
| 65 } |
| 66 |
| 67 // Flattened string should still be ascii. |
| 68 assertTrue(isAsciiString(str1)); |
| 69 |
| 70 // Lower-casing an ascii string should produce ascii. |
| 71 assertTrue(isAsciiString(str1.toLowerCase())); |
| 72 |
| 73 assertFalse(isAsciiString(["a", realTwoByteExternalString].join(""))); |
| 74 |
| 75 // Appending a real two-byte string should produce a two-byte cons. |
| 76 var str2 = str + realTwoByteExternalString; |
| 77 assertFalse(isAsciiString(str2)); |
| 78 |
| 79 // Force flattening of the string. |
| 80 old_length = str2.length - realTwoByteExternalString.length; |
| 81 for (var i = 0; i < old_length; i++) { |
| 82 assertEquals(String.fromCharCode(i & 0x7f), str2[i]); |
| 83 } |
| 84 for (var i = old_length; i < str.length; i++) { |
| 85 assertEquals("\u1234", str2[i]); |
| 86 } |
| 87 |
| 88 // Flattened string should still be two-byte. |
| 89 assertFalse(isAsciiString(str2)); |
| 90 } |
| 91 |
| 92 // Run the test many times to ensure IC-s don't break things. |
| 93 for (var i = 0; i < 10; i++) { |
| 94 test(); |
| 95 } |
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